57503221 has 2 divisors, whose sum is σ = 57503222. Its totient is φ = 57503220.

The previous prime is 57503209. The next prime is 57503227. The reversal of 57503221 is 12230575.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31798321 + 25704900 = 5639^2 + 5070^2 .

It is a cyclic number.

It is not a de Polignac number, because 57503221 - 2⁷ = 57503093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57503227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28751610 + 28751611.

It is an arithmetic number, because the mean of its divisors is an integer number (28751611).

Almost surely, 2^57503221 is an apocalyptic number.

It is an amenable number.

57503221 is a deficient number, since it is larger than the sum of its proper divisors (1).

57503221 is an equidigital number, since it uses as much as digits as its factorization.

57503221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 57503221 is about 7583.0878275278. The cubic root of 57503221 is about 385.9793383842.

Adding to 57503221 its reverse (12230575), we get a palindrome (69733796).

The spelling of 57503221 in words is "fifty-seven million, five hundred three thousand, two hundred twenty-one".